Which of the following commands is used to set the FreeBSD security level?

The sysctl command is used to set and get kernel state variables, including the FreeBSD security level. The security level is a variable named kern.securelevel, which can have values from -1 to 3, with higher values indicating more restrictions. The security level can only be increased, not decreased, unless the system is rebooted or in single-user mode. The security level affects various operations, such as loading kernel modules, changing immutable flags on files, and modifying device nodes12 References: 1: https://docs.freebsd.org/en/books/handbook/security/#security-basics-securelevels  2: https://www.freebsd.org/cgi/man.cgi?query=sysctl &sektion=8